NOVA

The 170-Year Search for a Planet Beyond Neptune

Clip: Season 46 | 2m 29s

Planet Nine’s existence is not the first time astronomers have predicted a planet they couldn’t see. Clyde Tombaugh was looking for Planet X when he accidentally found Pluto. After Voyager 2 flew by Neptune in 1989, new calculations determined there was no Planet X. But three years ago, a disturbance was detected at the far reaches of the Solar System.

Aired: 06/10/19

Rating: NR

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